wpa_supplicant: Make internally used crypto headers private

A lot of internally used crypto headers are publicly includeable
in user projects. This leads to bug reports when these headers
are incorrectly used or the API's are not used as intended.

Move all crypto headers into private crypto src folder, also move
crypto_ops into Supplicant to remove dependecy on crypto headers.

Closes IDF-476

components/wpa_supplicant/src/crypto/sha256.h

@@ -0,0 +1,27 @@
+/*
+ * SHA256 hash implementation and interface functions
+ * Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#ifndef SHA256_H
+#define SHA256_H
+
+#define SHA256_MAC_LEN 32
+
+void hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
+		      const u8 *addr[], const size_t *len, u8 *mac);
+void hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
+		 size_t data_len, u8 *mac);
+void sha256_prf(const u8 *key, size_t key_len, const char *label,
+	      const u8 *data, size_t data_len, u8 *buf, size_t buf_len);
+
+#endif /* SHA256_H */